Pressure Protector Structure for High-Voltage Capacitor Fault Detection
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Solution Overview
Problem
High-voltage self-healing capacitors face challenges in reliable relay protection for internal faults due to their unique material, structure, and working principles, which can lead to delayed detection and increased risk of equipment damage from internal pressure increases and potential bursting.
Innovation Solution
A pressure protector system comprising a movable bolt assembly, fixed and movable electrode assemblies, and a polycarbonate protector shell with specific geometries and materials, which creates a short-circuit between terminals when internal pressure exceeds a certain threshold, enabling early detection and disconnection of faulty capacitors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a broken type protection device is used in high-voltage self-healing parallel capacitor, then the capacitor can be protected from overpressure, but the insulation distance and shape of the fracture cannot meet the requirement for isolating high voltage, causing after-burning or re-breakdown
Solution Approach 1:
The patent introduces a pressure-actuated switch as an intermediary device that mediates between the pressure condition and the circuit breaking action. The switch includes a pressure-sensitive component that activates electrical contacts to open the circuit when pressure exceeds a threshold, providing controlled protection without the harmful effects of uncontrolled fracturing. This intermediary mechanism ensures both protection reliability and electrical isolation safety.
2Reliability
If the internal pressure of the capacitor is rapidly increased due to large-area breakdown, then the shell may bulge and burst, but the fault signal is easily annihilated due to false appearance such as small capacitance change
Solution Approach 1:
The patent implements a feedback mechanism where the pressure-actuated switch continuously monitors the internal pressure condition and provides feedback to the circuit protection system. When pressure changes indicate a fault condition, the switch activates to open the circuit, providing immediate feedback about the fault state. This feedback system enables reliable fault detection even when traditional capacitance change measurements are ambiguous or masked by false appearances.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The pressure protector effectively prevents capacitor bursts by enabling early detection of internal faults and ensuring safe operation by generating unbalanced voltage or current for relay protection, thus avoiding accidents.
Implementation Method 1
When the internal pressure of the capacitor is gradually increased, the spring tube of the movable bolt assembly is gradually compressed
Implementation Method 2
the spring tube of the movable bolt assembly is gradually compressed, the bolt body is slowly moved upwards by the pressure
Implementation Method 3
the medium at the breakdown part is decomposed by an electric arc to generate a large amount of gas
Implementation Method 4
the medium at the breakdown part is decomposed by an electric arc to generate a large amount of gas
Data Source
AI summary
A pressure protector for a high-voltage self-healing capacitor. is composed of a box shell, a cover plate, a core, filled resin, a pressure protector and wiring terminals. The pressure protector is arranged in the capacitor, and the pressure protector is mainly composed of fixed studs, a protector shell, a movable bolt assembly, a fixed electrode assembly, a movable electrode assembly, first fixed bolts and a limiting bolt. The pressure protector for a high-voltage self-healing capacitor is simple in structure and convenient to install and use, the technical problem of relay protection of internal faults of the self-healing capacitor can be solved. Accidents can be effectively avoided, and the requirement for safe operation of the capacitor can be met.